/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include "uv.h"
#include "internal.h"

#include <assert.h>
#include <string.h>
#include <errno.h>

#include <kvm.h>
#include <paths.h>
#include <ifaddrs.h>
#include <unistd.h>
#include <time.h>
#include <stdlib.h>
#include <fcntl.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <uvm/uvm_extern.h>

#include <unistd.h>
#include <time.h>

#undef NANOSEC
#define NANOSEC ((uint64_t)1e9)

static char* process_title;

int uv__platform_loop_init(uv_loop_t* loop)
{
    return uv__kqueue_init(loop);
}

void uv__platform_loop_delete(uv_loop_t* loop)
{
}

uint64_t uv__hrtime(uv_clocktype_t type)
{
    struct timespec ts;
    clock_gettime(CLOCK_MONOTONIC, &ts);
    return (((uint64_t)ts.tv_sec) * NANOSEC + ts.tv_nsec);
}

void uv_loadavg(double avg[3])
{
    struct loadavg info;
    size_t size = sizeof(info);
    int which[] = { CTL_VM, VM_LOADAVG };

    if (sysctl(which, 2, &info, &size, NULL, 0) == -1)
        return;

    avg[0] = (double)info.ldavg[0] / info.fscale;
    avg[1] = (double)info.ldavg[1] / info.fscale;
    avg[2] = (double)info.ldavg[2] / info.fscale;
}

int uv_exepath(char* buffer, size_t* size)
{
    int mib[4];
    size_t cb;
    pid_t mypid;

    if (buffer == NULL || size == NULL || *size == 0)
        return -EINVAL;

    mypid = getpid();
    mib[0] = CTL_KERN;
    mib[1] = KERN_PROC_ARGS;
    mib[2] = mypid;
    mib[3] = KERN_PROC_ARGV;

    cb = *size;
    if (sysctl(mib, 4, buffer, &cb, NULL, 0))
        return -errno;
    *size = strlen(buffer);

    return 0;
}

uint64_t uv_get_free_memory(void)
{
    struct uvmexp info;
    size_t size = sizeof(info);
    int which[] = { CTL_VM, VM_UVMEXP };

    if (sysctl(which, 2, &info, &size, NULL, 0))
        return -errno;

    return (uint64_t)info.free * sysconf(_SC_PAGESIZE);
}

uint64_t uv_get_total_memory(void)
{
#if defined(HW_PHYSMEM64)
    uint64_t info;
    int which[] = { CTL_HW, HW_PHYSMEM64 };
#else
    unsigned int info;
    int which[] = { CTL_HW, HW_PHYSMEM };
#endif
    size_t size = sizeof(info);

    if (sysctl(which, 2, &info, &size, NULL, 0))
        return -errno;

    return (uint64_t)info;
}

char** uv_setup_args(int argc, char** argv)
{
    process_title = argc ? uv__strdup(argv[0]) : NULL;
    return argv;
}

int uv_set_process_title(const char* title)
{
    if (process_title)
        uv__free(process_title);

    process_title = uv__strdup(title);
    setproctitle("%s", title);

    return 0;
}

int uv_get_process_title(char* buffer, size_t size)
{
    if (process_title) {
        strncpy(buffer, process_title, size);
    } else {
        if (size > 0) {
            buffer[0] = '\0';
        }
    }

    return 0;
}

int uv_resident_set_memory(size_t* rss)
{
    kvm_t* kd = NULL;
    struct kinfo_proc2* kinfo = NULL;
    pid_t pid;
    int nprocs;
    int max_size = sizeof(struct kinfo_proc2);
    int page_size;

    page_size = getpagesize();
    pid = getpid();

    kd = kvm_open(NULL, NULL, NULL, KVM_NO_FILES, "kvm_open");

    if (kd == NULL)
        goto error;

    kinfo = kvm_getproc2(kd, KERN_PROC_PID, pid, max_size, &nprocs);
    if (kinfo == NULL)
        goto error;

    *rss = kinfo->p_vm_rssize * page_size;

    kvm_close(kd);

    return 0;

error:
    if (kd)
        kvm_close(kd);
    return -EPERM;
}

int uv_uptime(double* uptime)
{
    time_t now;
    struct timeval info;
    size_t size = sizeof(info);
    static int which[] = { CTL_KERN, KERN_BOOTTIME };

    if (sysctl(which, 2, &info, &size, NULL, 0))
        return -errno;

    now = time(NULL);

    *uptime = (double)(now - info.tv_sec);
    return 0;
}

int uv_cpu_info(uv_cpu_info_t** cpu_infos, int* count)
{
    unsigned int ticks = (unsigned int)sysconf(_SC_CLK_TCK);
    unsigned int multiplier = ((uint64_t)1000L / ticks);
    unsigned int cur = 0;
    uv_cpu_info_t* cpu_info;
    u_int64_t* cp_times;
    char model[512];
    u_int64_t cpuspeed;
    int numcpus;
    size_t size;
    int i;

    size = sizeof(model);
    if (sysctlbyname("machdep.cpu_brand", &model, &size, NULL, 0) && sysctlbyname("hw.model", &model, &size, NULL, 0)) {
        return -errno;
    }

    size = sizeof(numcpus);
    if (sysctlbyname("hw.ncpu", &numcpus, &size, NULL, 0))
        return -errno;
    *count = numcpus;

    /* Only i386 and amd64 have machdep.tsc_freq */
    size = sizeof(cpuspeed);
    if (sysctlbyname("machdep.tsc_freq", &cpuspeed, &size, NULL, 0))
        cpuspeed = 0;

    size = numcpus * CPUSTATES * sizeof(*cp_times);
    cp_times = uv__malloc(size);
    if (cp_times == NULL)
        return -ENOMEM;

    if (sysctlbyname("kern.cp_time", cp_times, &size, NULL, 0))
        return -errno;

    *cpu_infos = uv__malloc(numcpus * sizeof(**cpu_infos));
    if (!(*cpu_infos)) {
        uv__free(cp_times);
        uv__free(*cpu_infos);
        return -ENOMEM;
    }

    for (i = 0; i < numcpus; i++) {
        cpu_info = &(*cpu_infos)[i];
        cpu_info->cpu_times.user = (uint64_t)(cp_times[CP_USER + cur]) * multiplier;
        cpu_info->cpu_times.nice = (uint64_t)(cp_times[CP_NICE + cur]) * multiplier;
        cpu_info->cpu_times.sys = (uint64_t)(cp_times[CP_SYS + cur]) * multiplier;
        cpu_info->cpu_times.idle = (uint64_t)(cp_times[CP_IDLE + cur]) * multiplier;
        cpu_info->cpu_times.irq = (uint64_t)(cp_times[CP_INTR + cur]) * multiplier;
        cpu_info->model = uv__strdup(model);
        cpu_info->speed = (int)(cpuspeed / (uint64_t)1e6);
        cur += CPUSTATES;
    }
    uv__free(cp_times);
    return 0;
}

void uv_free_cpu_info(uv_cpu_info_t* cpu_infos, int count)
{
    int i;

    for (i = 0; i < count; i++) {
        uv__free(cpu_infos[i].model);
    }

    uv__free(cpu_infos);
}

int uv_interface_addresses(uv_interface_address_t** addresses, int* count)
{
    struct ifaddrs *addrs, *ent;
    uv_interface_address_t* address;
    int i;
    struct sockaddr_dl* sa_addr;

    if (getifaddrs(&addrs))
        return -errno;

    *count = 0;

    /* Count the number of interfaces */
    for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
        if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) || (ent->ifa_addr == NULL) || (ent->ifa_addr->sa_family != PF_INET)) {
            continue;
        }
        (*count)++;
    }

    *addresses = uv__malloc(*count * sizeof(**addresses));

    if (!(*addresses)) {
        freeifaddrs(addrs);
        return -ENOMEM;
    }

    address = *addresses;

    for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
        if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)))
            continue;

        if (ent->ifa_addr == NULL)
            continue;

        if (ent->ifa_addr->sa_family != PF_INET)
            continue;

        address->name = uv__strdup(ent->ifa_name);

        if (ent->ifa_addr->sa_family == AF_INET6) {
            address->address.address6 = *((struct sockaddr_in6*)ent->ifa_addr);
        } else {
            address->address.address4 = *((struct sockaddr_in*)ent->ifa_addr);
        }

        if (ent->ifa_netmask->sa_family == AF_INET6) {
            address->netmask.netmask6 = *((struct sockaddr_in6*)ent->ifa_netmask);
        } else {
            address->netmask.netmask4 = *((struct sockaddr_in*)ent->ifa_netmask);
        }

        address->is_internal = !!(ent->ifa_flags & IFF_LOOPBACK);

        address++;
    }

    /* Fill in physical addresses for each interface */
    for (ent = addrs; ent != NULL; ent = ent->ifa_next) {
        if (!((ent->ifa_flags & IFF_UP) && (ent->ifa_flags & IFF_RUNNING)) || (ent->ifa_addr == NULL) || (ent->ifa_addr->sa_family != AF_LINK)) {
            continue;
        }

        address = *addresses;

        for (i = 0; i < (*count); i++) {
            if (strcmp(address->name, ent->ifa_name) == 0) {
                sa_addr = (struct sockaddr_dl*)(ent->ifa_addr);
                memcpy(address->phys_addr, LLADDR(sa_addr), sizeof(address->phys_addr));
            }
            address++;
        }
    }

    freeifaddrs(addrs);

    return 0;
}

void uv_free_interface_addresses(uv_interface_address_t* addresses, int count)
{
    int i;

    for (i = 0; i < count; i++) {
        uv__free(addresses[i].name);
    }

    uv__free(addresses);
}
